780 lines
24 KiB
NASM
780 lines
24 KiB
NASM
; This program parses .fas file generated by fasm
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; and prints the list of dependencies for make.
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; Usage: fasmdep [-e] [<input file> [<output file>]].
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; If input file is not given, the program reads from stdin.
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; If output file is not given, the program writes to stdout.
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; If the option -e is given, the program also creates an empty
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; goal for every dependency, this prevents make errors when
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; files are renamed.
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; This definition controls the choice of platform-specific code.
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;define OS WINDOWS
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define OS LINUX
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; Program header.
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match =WINDOWS,OS { include 'windows_header.inc' }
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match =LINUX,OS { include 'linux_header.inc' }
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include 'fas.inc'
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; Main code
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start:
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; 1. Setup stack frame, zero-initialize all local variables.
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virtual at ebp - .localsize
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.begin:
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.flags dd ? ; 1 if '-e' is given
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.in dd ? ; handle of input file
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.out dd ? ; handle of output file
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.buf dd ? ; pointer to data of .fas file
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.allocated dd ? ; number of bytes allocated for .buf
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.free dd ? ; number of bytes free in .buf
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.outstart dd ? ; offset in .buf for start of data to output
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.names dd ? ; offset in .buf for start of output names
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.include dd ? ; offset in .buf to value of %INCLUDE%
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.testname dd ? ; offset in .buf for start of current file name
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.prevfile dd ? ; offset in .buf for previous included file name
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.prevfilefrom dd ? ; offset in .buf for .asm/.inc for .prevfile
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.localsize = $ - .begin
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match =LINUX,OS {
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.argc dd ?
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.argv:
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}
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end virtual
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mov ebp, esp
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xor eax, eax
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repeat .localsize / 4
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push eax
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end repeat
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; 2. Call the parser of the command line.
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call get_params
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; 3. Load the input file.
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; Note that stdin can be a pipe,
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; useful in bash-construction "fasm input.asm -s >(fasmdep > input.Po)",
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; so its size is not always known in the beginning.
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; So, we must read input file in portions, reallocating memory if needed.
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.readloop:
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; 3a. If the size is less than 32768 bytes, reallocate buffer.
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; Otherwise, goto 3c.
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cmp [.free], 32768
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jae .norealloc
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; 3b. Reallocate buffer.
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; Start with 65536 bytes and then double the size every time.
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mov eax, 65536
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mov ecx, [.allocated]
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add ecx, ecx
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jz @f
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mov eax, ecx
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@@:
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call realloc
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.norealloc:
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; 3c. Read the next portion.
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call read
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sub [.free], eax
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test eax, eax
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jnz .readloop
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; 4. Sanity checks.
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; We don't use .section_* and .symref_*, so allow them to be absent.
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mov edi, [.allocated]
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sub edi, [.free]
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; Note that edi = number of bytes which were read
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; and simultaneously pointer to free space in the buffer relative to [.buf].
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cmp edi, fas_header.section_offs
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jb badfile
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mov ebx, [.buf]
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cmp [ebx+fas_header.signature], FAS_SIGNATURE
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jnz badfile
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cmp [ebx+fas_header.headersize], fas_header.section_offs
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jb badfile
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; 5. Get %INCLUDE% environment variable, it will be useful.
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mov [.include], edi
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mov esi, include_variable
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sub esi, ebx
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call get_environment_variable
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; 6. Start writing dependencies: copy output and input files.
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mov [.outstart], edi
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; 6a. Copy output name.
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mov esi, [ebx+fas_header.output]
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call copy_asciiz_escaped
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; 6b. Write ": ".
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stdcall alloc_in_buf, 2
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mov word [edi+ebx], ': '
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inc edi
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inc edi
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; 6c. Copy input name.
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mov [.names], edi
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mov esi, [ebx+fas_header.input]
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call copy_asciiz_escaped
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; 7. Scan for 'include' dependencies.
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; 7a. Get range for scanning.
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mov edx, [ebx+fas_header.preproc_size]
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mov esi, [ebx+fas_header.preproc_offs]
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add edx, esi
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.include_loop:
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; 7b. Loop over preprocessed lines in the range.
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cmp esi, edx
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jae .include_done
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; 7c. For every line, ignore header and do internal loop over tokens.
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add esi, preproc_line_header.contents
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.include_loop_int:
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; There are five types of tokens:
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; 1) "start preprocessor data" with code ';' <byte length> <length*byte token>
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; 2) "quoted string" with code '"' <dword length> <length*byte string>
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; 3) "word" with code 1Ah <byte length> <length*byte word>
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; 4) one-byte tokens like "+", "(" and so on
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; 5) "end-of-line" token with code 0.
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mov al, [esi+ebx]
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inc esi
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; 7d. First, check token type parsing the first byte.
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; For preprocessor tokens, continue to 7e.
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; For quoted strings, go to 7g.
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; For words, go to 7h.
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; For end-of-line, exit the internal loop, continue the external loop.
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; Otherwise, just continue the internal loop.
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cmp al, ';'
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jnz .notprep
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; 7e. For "include" tokens length=7, token is "include", the next token is
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; quoted string.
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; These tokens are handled in 7f, other preprocessor tokens in 7g.
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cmp byte [esi+ebx], 7
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jnz .notinclude
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cmp dword [esi+ebx+1], 'incl'
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jnz .notinclude
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cmp dword [esi+ebx+5], 'ude"'
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jnz .notinclude
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; 7f. Skip over end of this token and the type byte of the next token;
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; this gives the pointer to length-prefixed string, which should be added
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; to dependencies. Note that doing that skips that string,
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; so after copying just continue the internal loop.
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add esi, 9
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call add_separator
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call copy_name_escaped
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jmp .include_loop_int
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.quoted:
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; 7g. To skip a word, load the dword length and add it to pointer.
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add esi, [esi+ebx]
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add esi, 4
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jmp .include_loop_int
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.notinclude:
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; 7h. To skip this token, load the byte length and add it to pointer.
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; Note that word tokens and preprocessor tokens have a similar structure,
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; so both are handled here.
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movzx eax, byte [esi+ebx]
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lea esi, [esi+eax+1]
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jmp .include_loop_int
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.notprep:
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cmp al, 1Ah
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jz .notinclude
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cmp al, '"'
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jz .quoted
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test al, al
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jnz .include_loop_int
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jmp .include_loop
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.include_done:
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; 8. Scan for 'file' dependencies.
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; 8a. Get range for scanning.
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; Note that fas_header.asm_size can be slighly greater than the
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; real size, so we break from the loop when there is no space left
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; for the entire asm_row structure, not when .asm_size is exactly reached.
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mov esi, [ebx+fas_header.asm_offs]
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mov edx, [ebx+fas_header.asm_size]
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add edx, esi
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sub edx, asm_row.sizeof
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push edx
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jc .file_done
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.file_loop:
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; 8b. Loop over assembled lines in the range.
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cmp esi, [esp]
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ja .file_done
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; 8c. For every assembled line, skip "word" and one-byte tokens
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; scanning for three predefined word tokens.
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; Note that lines like "a:b:c:d file 'something'" are possible and valid.
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; go to 8d for token 'file',
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; go to 8e for token 'format',
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; go to 8f for token 'section',
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; continue the loop otherwise.
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mov eax, [esi+ebx+asm_row.preproc_offs]
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add eax, [ebx+fas_header.preproc_offs]
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; We save/restore esi since it is used for another thing in the internal loop;
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; we push eax, which currently contains ebx-relative pointer to
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; preproc_line_header, to be able to access it from resolve_name.
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push esi eax
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.file_tokens_loop:
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mov cl, byte [eax+ebx+preproc_line_header.contents]
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cmp cl, 1Ah
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jnz .file_noword_token
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movzx ecx, byte [eax+ebx+preproc_line_header.contents+1]
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cmp cl, 4
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jnz .file_no_file
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cmp dword [eax+ebx+preproc_line_header.contents+2], 'file'
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jnz .file_no_file4
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; 8d. For lines starting with 'file' token, loop over tokens and get names.
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; Note that there can be several names in one line.
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; Parsing of tokens is similar to step 5 with the difference that
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; preprocessor token stops processing: 'file' directives are processed
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; in assembler stage.
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lea esi, [eax+preproc_line_header.contents+6]
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.file_loop_int:
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mov al, [esi+ebx]
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inc esi
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test al, al
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jz .file_next
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cmp al, ';'
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jz .file_next
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cmp al, 1Ah
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jz .fileword
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cmp al, '"'
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jnz .file_loop_int
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call resolve_name
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add esi, [esi+ebx-4]
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jmp .file_loop_int
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.fileword:
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movzx eax, byte [esi+ebx]
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lea esi, [esi+eax+1]
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jmp .file_loop_int
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.file_no_file4:
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cmp dword [eax+ebx+preproc_line_header.contents+2], 'data'
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jnz .file_word_token
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jmp .file_scan_from
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.file_no_file:
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cmp cl, 6
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jnz .file_no_format
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cmp dword [eax+ebx+preproc_line_header.contents+2], 'form'
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jnz .file_no_format
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cmp word [eax+ebx+preproc_line_header.contents+6], 'at'
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jnz .file_no_format
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; 8e. For lines starting with 'format' token, loop over tokens and look for stub name.
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; Note that there can be another quoted string, namely file extension;
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; stub name always follows the token 'on'.
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mov edx, TokenOn
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call scan_after_word
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jmp .file_next
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.file_no_format:
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cmp cl, 7
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jnz .file_no_section
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cmp dword [eax+ebx+preproc_line_header.contents+2], 'sect'
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jnz .file_no_section
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mov edx, dword [eax+ebx+preproc_line_header.contents+6]
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and edx, 0FFFFFFh
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cmp edx, 'ion'
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jnz .file_no_section
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.file_scan_from:
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mov edx, TokenFrom
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call scan_after_word
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jmp .file_next
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.file_no_section:
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.file_word_token:
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lea eax, [eax+ecx+2]
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jmp .file_tokens_loop
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.file_noword_token:
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inc eax
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test cl, cl
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jz .file_next
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cmp cl, 3Bh
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jz .file_next
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cmp cl, 22h
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jnz .file_tokens_loop
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.file_next:
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pop eax esi
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add esi, asm_row.sizeof
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jmp .file_loop
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.file_done:
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pop edx
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; 9. Write result.
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; 9a. Append two newlines to the end of buffer.
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stdcall alloc_in_buf, 2
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mov word [edi+ebx], 10 * 101h
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inc edi
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inc edi
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; 9b. If '-e' option was given, duplicate dependencies list as fake goals
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; = copy all of them and append ":\n\n".
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cmp [.flags], 0
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jz .nodup
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lea ecx, [edi+1]
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mov esi, [.names]
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sub ecx, esi
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stdcall alloc_in_buf, ecx
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add esi, ebx
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add edi, ebx
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rep movsb
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mov byte [edi-3], ':'
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mov word [edi-2], 10 * 101h
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sub edi, ebx
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.nodup:
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; 9c. Write to output file.
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mov eax, [.outstart]
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sub edi, eax
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add eax, ebx
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call write
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; 10. Exit.
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xor eax, eax
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call exit
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; Helper procedure for steps 8e and 8f of main algorithm.
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; Looks for quoted strings after given word in edx.
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scan_after_word:
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push esi eax
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lea esi, [eax+preproc_line_header.contents+2+ecx]
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.loop:
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xor ecx, ecx
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.loop_afterword:
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mov al, [esi+ebx]
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inc esi
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test al, al
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jz .loop_done
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cmp al, ';'
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jz .loop_done
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cmp al, 1Ah
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jz .word
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cmp al, '"'
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jnz .loop
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test ecx, ecx
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jz .skip_quoted
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call resolve_name
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.loop_done:
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pop eax esi
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ret
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.skip_quoted:
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add esi, [esi+ebx]
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add esi, 4
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jmp .loop
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.word:
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movzx ecx, byte [esi+ebx]
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lea esi, [esi+ecx+1]
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cmp cl, byte [edx]
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jnz .loop
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push esi edi
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add esi, ebx
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sub esi, ecx
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lea edi, [edx+1]
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repz cmpsb
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pop edi esi
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jnz .loop
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dec ecx
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jmp .loop_afterword
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; Helper procedure for step 6 of the main procedure.
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; Copies the ASCIIZ name from strings section to the buffer.
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copy_asciiz_escaped:
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add esi, [ebx+fas_header.strings_offs]
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.loop:
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mov al, [esi+ebx]
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test al, al
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jz .nothing
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call copy_char_escaped
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jmp .loop
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.nothing:
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ret
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; Helper procedure for step 7 of the main procedure.
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; Copies the name with known length to the buffer.
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copy_name_escaped:
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mov ecx, [esi+ebx]
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add esi, 4
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test ecx, ecx
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jz .nothing
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push ecx
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.loop:
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mov al, [esi+ebx]
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call copy_char_escaped
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dec dword [esp]
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jnz .loop
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pop ecx
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.nothing:
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ret
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; Helper procedure for steps 7 and 8 of the main procedure.
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; Writes separator of file names in output = " \\\n".
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add_separator:
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stdcall alloc_in_buf, 3
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mov word [edi+ebx], ' \'
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mov byte [edi+ebx+2], 10
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add edi, 3
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ret
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; Helper procedure for step 7 of the main procedure.
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; Resolves the path to 'file' dependency and copies
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; the full name to the buffer.
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resolve_name:
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; FASM uses the following order to search for referenced files:
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; * path of currently assembling file, which may be .asm or .inc
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; * paths from %INCLUDE% for versions >= 1.70
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; * current directory = file name is taken as is, without prepending dir name
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; We mirror this behaviour, trying to find an existing file somewhere.
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; There can be following reasons for the file can not be found anywhere:
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; * it has been deleted between compilation and our actions
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; * it didn't exist at all, compilation has failed
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; * we are running in environment different from fasm environment.
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; Assume that the last reason is most probable and that invalid dependency
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; is better than absent dependency (it is easier to fix an explicit error
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; than a silent one) and output file name without prepending dir name,
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; as in the last case. Actually, we even don't need to test existence
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; of the file in the current directory.
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add esi, 4 ; skip string length
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; 1. Get ebx-relative pointer to preproc_line_header, see the comment in start.7d
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mov eax, [esp+4]
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; 2. Get the path to currently processing file.
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push esi
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.getpath:
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test byte [eax+ebx+preproc_line_header.line_number+3], 80h
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jz @f
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mov eax, [eax+ebx+preproc_line_header.line_offset]
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add eax, [ebx+fas_header.preproc_offs]
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jmp .getpath
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@@:
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mov edx, [eax+ebx+preproc_line_header.source_name]
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test edx, edx
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jz .frommain
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add edx, [ebx+fas_header.preproc_offs]
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jmp @f
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.frommain:
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mov edx, [ebx+fas_header.input]
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add edx, [ebx+fas_header.strings_offs]
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@@:
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; 3. Check that it is not a duplicate of the previous dependency.
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; 3a. Compare preprocessor units.
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cmp edx, [start.prevfilefrom]
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jnz .nodup
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; 3b. Compare string lengths.
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mov eax, [start.prevfile]
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mov ecx, [eax+ebx-4]
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cmp ecx, [esi+ebx-4]
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jnz .nodup
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; 3c. Compare string contents.
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push esi edi
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lea edi, [eax+ebx]
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add esi, ebx
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rep cmpsb
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pop edi esi
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jnz .nodup
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; 3d. It is duplicate, just return.
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pop esi
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ret
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.nodup:
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; 3e. It is not duplicate. Output separator.
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mov [start.prevfilefrom], edx
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mov [start.prevfile], esi
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call add_separator
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; 4. Cut the last component of the path found in step 2.
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mov ecx, edx
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mov esi, edx
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.scanpath:
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mov al, [edx+ebx]
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test al, al
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jz .scandone
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cmp al, '/'
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jz .slash
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cmp al, '\'
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jnz .scannext
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.slash:
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lea ecx, [edx+1]
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.scannext:
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inc edx
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jmp .scanpath
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.scandone:
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sub ecx, esi
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; 5. Try path found in step 4. If found, go to step 8.
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mov [start.testname], edi
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stdcall copy_string, esi, ecx
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pop esi
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call expand_environment
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call test_file_exists
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test eax, eax
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jns .found
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call revert_testname
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; 6. Try each of include paths. For every path, if file is found, go to step 8.
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; Otherwise, continue loop over include path.
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; Skip this step before 1.70.
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|
cmp [ebx+fas_header.major], 1
|
|
ja .checkenv
|
|
jb .nocheckenv
|
|
cmp [ebx+fas_header.minor], 70
|
|
jb .nocheckenv
|
|
.checkenv:
|
|
mov ecx, [start.include]
|
|
.includeloop_ext:
|
|
mov eax, ecx
|
|
.includeloop_int:
|
|
cmp byte [eax+ebx], 0
|
|
jz @f
|
|
cmp byte [eax+ebx], ';'
|
|
jz @f
|
|
inc eax
|
|
jmp .includeloop_int
|
|
@@:
|
|
push eax
|
|
sub eax, ecx
|
|
jz @f
|
|
stdcall copy_string, ecx, eax
|
|
cmp byte [edi+ebx-1], '/'
|
|
jz .hasslash
|
|
@@:
|
|
stdcall alloc_in_buf, 1
|
|
mov byte [edi+ebx], '/'
|
|
inc edi
|
|
.hasslash:
|
|
call expand_environment
|
|
call test_file_exists
|
|
pop ecx
|
|
test eax, eax
|
|
jns .found
|
|
call revert_testname
|
|
cmp byte [ecx+ebx], 0
|
|
jz .notfound
|
|
inc ecx
|
|
cmp byte [ecx+ebx], 0
|
|
jnz .includeloop_ext
|
|
.nocheckenv:
|
|
.notfound:
|
|
; 7. File not found neither near the current preprocessor unit nor in %INCLUDE%.
|
|
; Assume that it is in the current directory.
|
|
call expand_environment
|
|
.found:
|
|
; 8. Currently we have file name from [start.testname] to edi;
|
|
; it is zero-terminated and not space-escaped. Fix both issues.
|
|
dec edi
|
|
inc [start.free]
|
|
push esi
|
|
mov edx, [start.testname]
|
|
.escapeloop:
|
|
cmp edx, edi
|
|
jae .escapedone
|
|
cmp byte [edx+ebx], ' '
|
|
jnz .noescape
|
|
stdcall alloc_in_buf, 1
|
|
mov ecx, edi
|
|
sub ecx, edx
|
|
push edi
|
|
add edi, ebx
|
|
lea esi, [edi-1]
|
|
std
|
|
rep movsb
|
|
cld
|
|
pop edi
|
|
inc edi
|
|
mov byte [edx+ebx], '\'
|
|
inc edx
|
|
.noescape:
|
|
inc edx
|
|
jmp .escapeloop
|
|
.escapedone:
|
|
pop esi
|
|
ret
|
|
|
|
; Helper procedure for resolve_name.
|
|
; Allocates space in the buffer and appends the given string to the buffer.
|
|
copy_string:
|
|
mov eax, [esp+8]
|
|
test eax, eax
|
|
jz .nothing
|
|
stdcall alloc_in_buf, eax
|
|
mov ecx, [esp+4]
|
|
.copy:
|
|
mov al, [ecx+ebx]
|
|
inc ecx
|
|
cmp al, '\'
|
|
jnz @f
|
|
mov al, '/'
|
|
@@:
|
|
mov [edi+ebx], al
|
|
inc edi
|
|
dec dword [esp+8]
|
|
jnz .copy
|
|
.nothing:
|
|
ret 8
|
|
|
|
; Helper procedure for resolve_name. Undoes appending of last file name.
|
|
revert_testname:
|
|
add [start.free], edi
|
|
mov edi, [start.testname]
|
|
sub [start.free], edi
|
|
ret
|
|
|
|
; Helper procedure for resolve_name. Copies string from esi to edi,
|
|
; expanding environment variables.
|
|
expand_environment:
|
|
; 1. Save esi to restore it in the end of function.
|
|
push esi
|
|
; 2. Push string length to the stack to be used as a variable.
|
|
pushd [esi+ebx-4]
|
|
; 3. Scan loop.
|
|
.scan:
|
|
; 3a. Scan for '%' sign.
|
|
call find_percent
|
|
.justcopy:
|
|
; 3b. Copy the part from the beginning of current portion to '%' sign,
|
|
; advance pointer to '%' sign, or end-of-string if no '%' found.
|
|
push eax
|
|
sub eax, esi
|
|
stdcall copy_string, esi, eax
|
|
pop esi
|
|
; 3c. If string has ended, break from the loop.
|
|
cmp dword [esp], 0
|
|
jz .scandone
|
|
; 3d. Advance over '%' sign.
|
|
inc esi
|
|
dec dword [esp]
|
|
; 3e. Find paired '%'.
|
|
call find_percent
|
|
; 3f. If there is no paired '%', just return to 3b and copy remaining data,
|
|
; including skipped '%'; after that, 3c would break from the loop.
|
|
dec esi
|
|
cmp dword [esp], 0
|
|
jz .justcopy
|
|
; 3g. Otherwise, get the value of environment variable.
|
|
; Since get_environment_variable requires zero-terminated string
|
|
; and returns zero-terminated string, temporarily overwrite trailing '%'
|
|
; and ignore last byte in returned string.
|
|
; Also convert any backslashes to forward slashes.
|
|
inc esi
|
|
mov byte [eax+ebx], 0
|
|
push eax
|
|
push edi
|
|
call get_environment_variable
|
|
dec edi
|
|
inc [start.free]
|
|
pop eax
|
|
.replaceslash:
|
|
cmp eax, edi
|
|
jz .replaceslash_done
|
|
cmp byte [eax+ebx], '\'
|
|
jnz @f
|
|
mov byte [eax+ebx], '/'
|
|
@@:
|
|
inc eax
|
|
jmp .replaceslash
|
|
.replaceslash_done:
|
|
pop esi
|
|
mov byte [esi+ebx], '%'
|
|
; 3h. Advance over trailing '%'.
|
|
inc esi
|
|
dec dword [esp]
|
|
; 3i. Continue the loop.
|
|
jmp .scan
|
|
.scandone:
|
|
; 4. Zero-terminate resulting string.
|
|
stdcall alloc_in_buf, 1
|
|
mov byte [edi+ebx], 0
|
|
inc edi
|
|
; 5. Pop stack variable initialized in step 2.
|
|
pop eax
|
|
; 6. Restore esi saved in step 1 and return.
|
|
pop esi
|
|
ret
|
|
|
|
; Helper procedure for expand_environment.
|
|
; Scans the string in esi with length [esp+4]
|
|
; until '%' is found or line ended.
|
|
find_percent:
|
|
mov eax, esi
|
|
cmp dword [esp+4], 0
|
|
jz .nothing
|
|
.scan:
|
|
cmp byte [eax+ebx], '%'
|
|
jz .nothing
|
|
inc eax
|
|
dec dword [esp+4]
|
|
jnz .scan
|
|
.nothing:
|
|
ret
|
|
|
|
; Helper procedure for copy_{name,asciiz}_escaped.
|
|
; Allocates space and writes one character, possibly escaped.
|
|
copy_char_escaped:
|
|
cmp al, ' '
|
|
jnz .noescape
|
|
stdcall alloc_in_buf, 1
|
|
mov byte [edi+ebx], '\'
|
|
inc edi
|
|
.noescape:
|
|
stdcall alloc_in_buf, 1
|
|
mov al, [esi+ebx]
|
|
inc esi
|
|
cmp al, '\'
|
|
jnz @f
|
|
mov al, '/'
|
|
@@:
|
|
mov [edi+ebx], al
|
|
inc edi
|
|
ret
|
|
|
|
; Helper procedure for ensuring that there is at least [esp+4]
|
|
; free bytes in the buffer.
|
|
alloc_in_buf:
|
|
mov eax, [esp+4]
|
|
sub [start.free], eax
|
|
jb .need_realloc
|
|
ret 4
|
|
.need_realloc:
|
|
mov eax, [start.allocated]
|
|
add eax, eax
|
|
push ecx edx
|
|
call realloc
|
|
pop edx ecx
|
|
cmp [start.free], 0
|
|
jl .need_realloc
|
|
mov ebx, [start.buf]
|
|
ret 4
|
|
|
|
badfile:
|
|
mov esi, badfile_string
|
|
call sayerr
|
|
mov al, 1
|
|
call exit
|
|
|
|
information:
|
|
mov esi, information_string
|
|
call sayerr
|
|
mov al, 2
|
|
call exit
|
|
|
|
nomemory:
|
|
mov esi, nomemory_string
|
|
call sayerr
|
|
mov al, 3
|
|
call exit
|
|
|
|
in_openerr:
|
|
mov esi, in_openerr_string
|
|
jmp in_err
|
|
readerr:
|
|
mov esi, readerr_string
|
|
in_err:
|
|
call sayerr
|
|
mov al, 4
|
|
call exit
|
|
|
|
out_openerr:
|
|
mov esi, out_openerr_string
|
|
jmp out_err
|
|
writeerr:
|
|
mov esi, writeerr_string
|
|
out_err:
|
|
call sayerr
|
|
mov al, 5
|
|
call exit
|
|
|
|
; Platform-specific procedures.
|
|
match =WINDOWS,OS { include 'windows_sys.inc' }
|
|
match =LINUX,OS { include 'linux_sys.inc' }
|
|
|
|
; Data
|
|
macro string a, [b] {
|
|
common
|
|
db a ## _end - a
|
|
a db b
|
|
a ## _end:
|
|
}
|
|
|
|
string information_string, 'Usage: fasmdep [-e] [<input.fas> [<output.Po>]]',10
|
|
string badfile_string, 'Not .fas file',10
|
|
string nomemory_string, 'No memory',10
|
|
string in_openerr_string, 'Cannot open input file',10
|
|
string readerr_string, 'Read error',10
|
|
string out_openerr_string, 'Cannot create output file',10
|
|
string writeerr_string, 'Write error',10
|
|
|
|
include_variable db 'INCLUDE',0
|
|
TokenOn db 2,'on'
|
|
TokenFrom db 4,'from'
|